The behaviour is expected. All math internally is in binary and the results
is often inexact. Internally, the result is closer to 239.9999999999999.
Note that Int((2179.2 / 9.08) + .0000000000001) is 240.

CInt differs from the Fix and Int functions, which truncate,
rather than round, the fractional part of a number. When the
fractional part is exactly 0.5, the CInt function always rounds
it to the nearest even number. For example, 0.5 rounds to 0,
and 1.5 rounds to 2.